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Simple Summary  During the first days of chicks’ lives, chicks are still developing the thermoregulatory system, the gut function, and the immune system. The aim of this study was to investigate the effects of supplemental  Cinnamomum verum  as a phytogenic feed additive in the starter diet. Our findings suggested that the addition of  Cinnamomum verum  at 2000 mg/kg might increase body weight gain over 1–10, 1–14, and 1–21 days of age by improving relative breast weight, elevating serum albumin concentrations, duodenal villus height, and goblet cell density at prestarter period.    Abstract  Ross 308 broiler chicks ( n  = 240) aged 1 day were assigned to five groups for eight replicates (six chicks for each) (3♂ and 3♀). Basal dietary groups were supplemented by 2000, 4000, and 6000 mg/kg cinnamon (CN) for 21 days. Basal diet alone was used as a negative control, and basal antibiotic diet (Colimox) was used as a positive control. At 10, 14, and 21 days of age, chicks that received 2000 mg CN and Colimox had a higher body weight, resulting in an increase in body weight gain. CN also resulted in the maximum improvement in the feed conversion ratio and feed efficiency over 1–21 days at the level of 2000 mg/kg. At days 10, the maximum relative breast weight was 2000 mg/kg of CN. Mean serum albumin concentrations, duodenal villus height, and goblet cell density increased ( p  < 0.05) by 2000 mg/kg of CN, and mean serum globulin and total protein concentrations and crypt depth increased ( p  < 0.05) by 6000 mg/kg of CN compared with control. Increased cecal Escherichia coli number was CN dose-dependent. In conclusion, dietary inclusion of 2000 mg/kg CN can be applied as an alternative to in-feed antibiotics for broiler starter diet.

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Growth Performance, Serum Biochemical Indices, Duodenal Histomorphology, and Cecal Microbiota of Broiler Chickens Fed on Diets Supplemented with Cinnamon Bark Powder at Prestarter and Starter Phases